共查询到20条相似文献,搜索用时 109 毫秒
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通过选择流动相以及不同检测波长,使2-萘胺-3,6,8-三磺酸中的有机杂质得以完全分离。在240nm波长下检测,采用峰面积外标法对2-萘胺-3,6,8-三磺酸中的有机杂质定量。对该方法的准确度、精密度进行了测定。 相似文献
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采用新型消旋催化剂耦合Novozym 435成功构建1-四氢萘胺的动态动力学拆分体系用于制备光学纯(R)-1-四氢萘胺。该反应存在着自催化酰胺化反应,会降低反应的对映体选择性。从改变酰基供体结构的角度出发来抑制这种自催化酰胺化反应,考察了不同酸部以及不同醇部的酰基供体对1-四氢萘胺动态动力学拆分反应的影响,发现随着酰基供体结构变得复杂,1-四氢萘胺动态动力学拆分反应结果也相应变得越好,当采用戊酸对氯苯酯作为酰基供体时,动态动力学拆分反应结果就可达到最佳,即转化率>99%,光学纯度eeP>99%。 相似文献
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袁俊秀 《化学工业与工程技术》2010,31(2):6-8,14
进行了内电解法处理α-萘胺废水的研究,考察了溶液初始浓度、初始pH值、停留时间、铁炭比、铁屑粒度对处理效果的影响,得到了内电解法处理α-萘胺废水的最佳工艺条件。研究结果表明,微电解工艺对低浓度α-萘胺废水有良好的降解效果,在溶液初始pH值2.5、停留时间90 min、铁炭质量比5∶1、铁屑粒度0.06 mm(30目)时,α-萘胺降解率达93.2%,溶液总碳(TC)去除率达82.4%。 相似文献
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在介质pH为2~6,温度范围0~10℃条件下进行的三氟-氯嘧啶第一活泼氟原子与2-萘胺-4,6,8-三磺酸缩合的反应为2.25级反应,对三氟一氯嘧啶和2-萘胺-4,6,8-三磺酸均分别为一级,对氢氧根为0.25级。反应活化能E=15.98千卡/克分子。在较低的温度(例如5℃)和pH=5~6,尽量提高三氟一氯嘧啶和2-萘胺-4,6,8-三磺酸初始浓度条件下进行缩合反应最为有利。 相似文献
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用以邻二氯苯为溶剂的液相磺化法代替固相烘焙磺化法,在表面活性剂Tween-60和邻二氯苯存在的条件下,1-萘胺和硫酸经铵盐化、转位磺化、加碱(Na2CO3)成盐合成了1-氨基-4-萘磺酸钠。考察了不同有机溶剂、磺化反应时间、表面活性剂、母液套用对反应的影响。得到的最佳工艺条件为:1-萘胺35.8 g、w(H2SO4)=80%的硫酸33.6 g、邻二氯苯150 mL、Tween-60 1.5 g,磺化反应时间6 h,在该条件下1-氨基-4-萘磺酸钠收率可达90.6%。 相似文献
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Graft terpolymers of starch, 2-propenamide, and sodium 2-methyl-3-imino-4-oxohex-5-ene-1-sulfonate can be made by cerium-IV-initiated, free-radical polymerization of an aqueous monomer mixture on starch. Synthesis is conducted on aqueous, gelled, lintnerized potato starch at 30°C under a nitrogen atmosphere. Yields range from 50 to 100 wt % and products contain 9–52 wt % starch, 1–51 wt % 1-acidoethylene, and 18–65 wt % sodium 1-(2-methylprop-2N-yl-1-sulfonate)amidoethylene. Repeat unit ratios in the reaction product approximate monomer ratios in the reaction mixture. Fraction of starch grafted in a reaction decreases as the mole fraction of sulfonated monomer in the reaction mixture increases. No proof has been found for grafting of synthetic side chains to starch in monomer mixtures containing only sulfonated monomer. Starch graft copolymers with side chains composed of 1-amidoethylene units and a sulfonated 1-amidoethylene unit derivative, 1-(sodium[2-methylprop-2N-yl-1-sulfonate])amidoethylene, are water-soluble, thickening agents. The rheology of solutions of these copolymers is a function of the ratio of nonsulfonated to sulfonated repeat units in the synthetic chains of the molecule. Aqueous solutions of these products are shear thinning and have power law exponents which decrease 1) with increasing product concentration or 2) as the nonsulfonated to sulfonated repeat unit ratio moves toward 3/1. Limiting viscosity number of product in water decreases with increasing shear rate of measurement or with increasing salt concentration of the solvent. Formulas are derived from the theories of Kirkwood and Flory which show that for copolymers with constant molecular weight, expansion coefficient, and limiting viscosity number increase as the fraction of sulfonate-containing repeat units in the chain increase. This theoretical requirement and the limiting viscosity data for groups of samples prepared under identical synthesis conditions are used to show that molecular weight of the graft copolymer decreases as the fraction of sulfonated repeat units in the copolymer increases. Screen factor measurements show product solutions to be viscoelastic. 相似文献
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徐兆瑜 《精细化工原料及中间体》2008,(12)
介绍了吲哚及十几种吲哚化合物的性质、合成方法以及在医药领域中的应用简况,这些吲哚衍生物如:3-醛基吲哚-5-甲酸乙酯,5-甲氧基吲哚,3,3,-二吲哚甲烷(DIM)等。许多吲哚及其衍生物在治疗癌症,艾滋病、心血管疾病以及骨风湿性疾病、消炎、镇痛等医药治疗方面取得了显著成就,故对其相关化合物作了重点叙述。例如:MCM-41负载Lewis酸催化合成2-甲基吲哚,5-甲氧基吲哚,吲哚甲基海英的合成等。已经表明,吲哚及其衍生物在医药化工领域中的应用具有很好的前景,值得引起关注和进一步研究和开发。 相似文献
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J. D. Mcclure 《Journal of the American Oil Chemists' Society》1978,55(12):905-908
A simple and rapid method is described for the deter mination of alkene-1-sulfonates in α-olefin sulfonates (AOS). AOS are
primarily mixtures (detergent range) of sodium salts of alkene-1-sulfonates (mixture of double bond position isomers) and
hydroxyalkane-1-sulfonates plus small amounts of disulfonates in a 30-40% aqueous solution. The analysis consists of titrating
the sample in 98% acetic acid-2% water solution with a stream of ozone to an indicator endpoint (Rouge Organol B.S.) which
is detected photometrically. In tests with model compounds, a long carbon chain alkene-1-sulfonate, sodium hexadecene-1-sulfonate,
and a 1-alkene-1-sulfonate, sodium 1-propene-l-sulfonate, were quantitatively determined with no interference from a hydroxyalkane-1-sulfonate,
sodium hydroxytetradecane-1-sulfonate. In contrast, an alternative method of determining unsaturation, Brown hydrogenation,
does not quickly and quantitatively determine 1-alkene-1-sulfonates. 相似文献
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在对甲苯磺酸的催化下,庚醛、癸醛分别与3-氯-1,2-丙二醇通过缩合反应制备了氯代缩醛2-烷基-4-氯甲基-1,3-二氧杂环戊烷;再分别与亚硫酸钠进行磺化反应,合成了缩醛型可分解表面活性剂(2-烷基-1,3-二氧杂环-4)甲烷-1-磺酸钠盐,磺化产率分别为87.9%和87.3%;所得中间体和产物的结构经IR、1HNMR表征。对缩合反应的物料摩尔比、催化剂用量、反应时间等进行了优化,结果表明:n(庚醛)∶n(3-氯-1,2-丙二醇)=1∶1.2,对甲苯磺酸0.4g,反应时间20h为较佳合成条件,产率达66.51%~68.70%。测试了可分解表面活性剂Ⅱa、Ⅱb在盐酸溶液中的分解率,结果显示:分别在1.5、3h,分解率就可达100%。 相似文献
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在三氟化硼乙醚溶液的催化下,庚醛与环氧氯丙烷反应生成2-己基-4-氯甲基-1,3-二氧杂环戊烷。中间体再与亚硫酸钠进行磺化反应,合成缩醛型可分解表面活性剂(2-己基-1,3-二氧杂环戊烷-4)甲烷-1-磺酸钠盐。考察了原料摩尔比、催化剂用量、反应温度和反应时间对合成2-己基-4-氯甲基-1,3-二氧杂环戊烷产率的影响。最佳反应条件为n(环氧氯丙烷)∶n(庚醛)=1.125∶1,催化剂用量为0.5 mL,反应温度为55℃,反应时间6 h,产率为44.5%。所得中间体及目标产物经核磁及红外表征,并测定产物的临界胶束浓度cmc为3.0×10-3 mol/L。 相似文献
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《Journal of Sulfur Chemistry》2013,34(5):556-582
This review article is an attempt to survey literature describing synthetic methods and reactivity of imidazole-1-sulfonate esters (imidazylates) in substitution, elimination, and metal-catalyzed cross-coupling reactions. 相似文献
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In the methyltrioxorhenium-catalyzed epoxidation of alkenes, 1-methyl-3-(butyl-4-sulfonate) imidazolium betaine (MBSIB) was used as an additive, and 30% H2O2 was used as an oxidant. The introduction of 10-fold excess MBSIB improved the selectivity of epoxide formation without reducing the reaction rate by increasing the polarity of the catalytic system. Furthermore, the MTO–MBSIB system was stable throughout the entire catalytic run and increased the TON of the epoxidation of alkenes. 相似文献